Ok, when I downloaded and looked at the world I couldn't even find the tank, I think it was somewhere way up in the air. Anyway, I have brought it down to the ground now and I am going to have a file here for a better view of the tank.

Did you actually create this tank, or did you get it from a website? You are saying you that created the tank and/or texture, but I am not sure if you actually did this.